Bobbin drag means for spinning frames and similar machines



E. VOKURKA July 15, 1952 BOBBIN DRAG MEANS FOR SPINNING FRAMES AND SIMILAR MACHINES Filed July 6, 1950 L/LA UJQQQL Q Patented July 15, 1 952 BOBBINI DRAG MEANS FORVSPINNIVNG FRAMES AND SIMILAR MACHINES Eduard Vokurka, Poricl, near Trutnov,

. Czechoslovakia Application July 6, 1950, Serial No.'1l 2i248 In Czechoslovakia February 14, 1950 p 3 Claims.

The present invention relates to improvements in a spinning cap for cap spinning frames and similar machines.

It is a well known fact that the velocity of the spinning operation depends 'on the strength of the material to be spun and on the stress placed thereon during the spinning operation. The stress is produced in particular by the centrifugal force andby the resistance of .air and manifests itself by the formation of a balloon, .in particular in connection with ring spinning machines. If the operation is carried out in wet condition theabove deficiencies are still further increased by the weight of water contained in the yarn. An increase in the speed of operation causes the stress in the balloon to be raised in square and this fact is prohibitive to a substantial increase of speed and efficiency of such machines.

It has already been proposed to eliminate the saiddrawbaclrs by means of a spinning cap having for its purpose to entrain the yarn balloon by its rotation without contacting the same; this provision has partially removed the stress caused by the resistanceof air. To this end the knownspinning cap'is'provided at its open end with an inwardly directed'fiange, the inner circumference of which carries a guiding eyelet so that'there is nothing to hinder the thread or yarn supplied through the hollow axis of the spinning cap from forming a balloon.

The main objectof the presentinventmn is to provide a spirming cap which removes the above drawbacks and completely eliminates the stress placed on the yarn by the formation of the balloon and resistance of air. v v

A further object of the-invention is to provide a spinning cap of a very simple design by means of. which the efiiciency otring spinning and similar machines may. be. considerably increased.

Another object of the invention is to prov'ide a spinning cap which considerablysimplifies the design of "the machine with which it is employed.

Further objects and advantages of the invention will appear from the ensuing description.

According to the invention the spinning cap for ring spinning or similar machines is provided with'a hollow axial cavity for the supply of yarn and the guiding eyelet for the yarn isproyided 7 immediately adjacent the lower edge of the cap. The yarn or thread passing through the axial cavity adheres very soon after entering the interior of the cap to the inner wall thereof and is dragged along the same and thus smoothed on its circumference. The pull produced by the 2 J yarn or thread dragged in this way along. the wallof the spinning cap at high revolutlonsis made useof for imparting rotation to the spindle carrying the bobbin; the drive of the spindle which is. otherwise indispensable may then'be dispensed with and the whole spinning operation is performed by the drive of the spinning cap only. In order to control the speed of rotation of the bobbin braking means are provided on the spindle preferably in the point where the whirl is normally mounted, said braking device" being of the centrifugal fan type provided with a blade ring; :Theuppe'r' cover'of the ian againsit which the bobbin abuts is a full dis'c whereas the lower cover is provided with a suction orifice engaged from'below by a conical plug whichmay' be withdrawn from the orifice and ifi this way open or close the latter.

The invention will now be described on hand of the accompanying drawing showing an ex-- ample of the spinning cap accordingto the invention.

In the drawing;

Figure 1 shows a part elevational view and partially a longitudinal section through the entire arrangement'of the spinning cap 1 I I Figure 2 shows'on alarger scale a longitudinal section through the spinning cap itself and;' 2

Figure 3 is a cross-sectional view takenjalong the line AA from Figure 2 showing the mount-; ing of thespindle. V p

- In the frame 1 of the machine, a head portion 2 of a spinning cap 3 is mounted for rotationin frictionless bearings, said head portion being provided withan axial cavity for the passa e of the yarn into the interior of the spinningcap 3. A driving pulley 4 mounted on the head portion}. v v y ,II

The spinning cap 3 may have substantially'the shape of a cylindrical body (which may be called the operative-portion of the cap). with an ad: joining spherical portion at its upperend ex tending into the said cylindrical head 2, as clearly shown in the drawing. Immediately adjacent the lower edge of the inner portion of the spinning cap 3 the guiding eyelet 5 is provided, The bobbin Sis closely fitted on aspindle I mounted in asleeve B, which is carried by a holder 9. The end of-the spindle '1 together with the, sleeve 8 is secured in the holder 9 by a grub screw H] or by any similar means. The holder 9 ismounted for sliding movement in a carriage H of the machine and maintained by a spring l3 in a position in which its abutment l2 rests against the lower surface 3 of the carriage II. The spindle I is provided in its lower portion with a spiral groove for lubricating purposes and its lower conical end rests against a hard bearing plate I4. The spindle I is therefore freely rotatable in its seat in the sleeve 8. Details of the mounting are apparent fi3 '1 v1.

In thepart'of the spindle occupied-normally by. the whirl a fan I5 is provided, said fan comprising blades of any desired design and operating as art air brake.

orifice of which serves as the aspiration orifice of the fan. A conical plug I6 mounted-ion reciprocal movement on the holder 9 on a thread? preferably on a multiple thread. Thaconicale of the plug I6 is adapted to engagethe; aspi'r 10., The fan has a fullrtoncover l8 and. its lower cover I9 consists of a ring-the centralZ;-

' porting shaft so as to move into and out of said suction orifice thereby controlling the same and the braking action of said fan.

tion orifice in the fan I5 and according 'to' its' longitudinal position to open or to close said ori fice and so to change the-efficiency of the braking fall-1%. The; longitudinal; movemennor; the: plug? L8.- is controlled by alrack; 1:7; engagingiwith CQHBspDnd: ing: @1 1; on the;.circ umference: of; the plug: "6;;

The: spinning: can ccordingto; the, invention neratesaszfollowsz. v.

finer-yarn; or; thread is introduced through: the; axiahcavity in the headlpontionz ofithespinning cap and-passed throughithe. eyelet 5* at. the: lower end of --,;the capandfastened to, the bobbin-,6 on the;sl2in 1e; 1; Rotation is vnow. imparted to the spinning cap; by: means of; the; pulley 4* fi'omrthe inrsit m of. the m -Qh nent consequenceor th -iqu c zrot tion of e n n i gnam the yarn is;: now spun in the; usual: way but it will-adhere er a sr w seoie n be; d a ged. alon the; same ,and, in this way smoothed.- onits circumference. This dragging.movementproduces acergtain tensionor pullwhich sets the bobbin 6 in-.rotation.;- The velocity, of. rotation oi the; bobn ma rbe s ml e by eb a ne; fan I5 by means of the plug IS. The plug, as already dis.- closed, may be moved longitudinally by-means; of therack I'I-so as to:clos e or uncover the-suction oijifice of theian, I5. as desireda The. more. the

plug I6 is withdrawnfrom the suction orifice, the largeramount. offairv is,- aspirated by, the fan; I 5 and the g reater the=bralring actiononthe spindle I, andviceversa.

. Asldisjclosed, above,.the;spinning cap. according to the present invention removes entirely any stress. placed on. the yarn, in consequence of; the formatioin of, the, balloon 4 and resistance; of air. 'Ihespi'nningmachine may thereforeoperatetwith higher. velocities thanheretofore possible, which fact .jcoiisiderahl'y increases the .efiiciency' of: such meanness a. p 7 V While'I have disclosed the principles of my inyentionin connection with one embodiment it will bf'fu'ndelljstood that this, embodiment-is given byway' of example only. and scope'ofthe invention as. 'set' forth in the. ap;

-I -claiinr I --I .*In--'a spinningfma'chiney in combination; 'a

not as limiting the supporting shaft having athreaded portionz' a spindlerotatably mounted with one end portion thereof in arr-axial bore ofz said supporting shaft; a bobbin 'closely fitted on the other end-"portion olrsaidnspindle a. brakingair fan fixedlyimo'unted -23 In a spinning machine, in combination, a

mountedwith one end portion thereof in an axial boreof' said supportingv shaft; a bobbin closely fitted on the other end portion of said spindle; a brakinglair-fan fixedly mounted on-said spindle and: provided, with a conical. suctionv orifice ex.- tending coaxially with and aroundsaid-z spindle;. a..conica1:.plug provided with. an innermultiple thread: and: mounted therewith. on said: threaded portion of said supporting: shaft. for longitudinal reciprocalimovement;.saidconicallplirg beingrpro: vided with an outer-gear; and a rackzbar mounted. onithe-zspinning machine for reciprocal; movement'and: engaging. saidouter: gear. ofsaid 110111081. plug. whereby; said plug may: be'..rotated1on .said threaded. portion; of said; supponting; shaft S0188 to; move into and outof said;suction orificethembyecontrolling the: samerand the; brakingaction ofrsaidafan;

- 3. In1,a spinning: machine,. in; combinationpa. supporting: shaftt: a' .:spindle;.110tatab1y, mounted with: one endtportion: thereof in an axial boreot said supporting shaft; a bobbin closely. fitted. on the; otherend portiomof; saidspindle; a braking ainfanefixedlyqmountedmn said spindle and; pro.- videdgwit-hga conical; suction; orifice extending coaxiailywithand around saidispindl'e; a: conical plugzmquntedion saidzsupporting,shaft-for lonai: tud-inal reciprocal: movement; andactuating meansgmountem on: the spinning rmaoh-ineband adapted. to; move-said; plug into; anduout or: said suction orifice thereby and;controllingv the; same andrthebrakingactionofisaldzfani EDUARD VQKURKA.

v REEEBENCESCITED The following. references. are of record. in". the fileroi this patent: V

UNITED sTA'rEsrAT N'rs Number; a

Great. Britain; May 11,1933 

